In the ancient times on the position of Baška Voda there was a settlement called Aronia; besides the archeological findings, scientists corroborate their claim with Tabula Peutingeriana, a map on which a homonymous settlement is marked right on the place of today's Baška Voda. In the late antiquity, from the end of the IV to the VII century there comes to the invasion of the barbaric peoples so the inhabitants rise a fort on Gradina to hide from the attacks, but also to control the entrance to the Brač canal. The residues of the walls of the settlement are visible on Gradina even today, and the numerous findings of amphoras and other ceramic material speak about the trade relations with the north Africa, the east Mediterranean and the Black Sea. Not far-away from Gradina a considerable amount of graves from the late ancient times are found, with multitude of grave supplements (lucernes, jewelery, glass dishes, little statues of Euterpa and Cupid etc). Beside the Roman, some tomb-stone writings state Illyrian names, by which it can be concluded that along with the Romans, there was a numerous autochthonous Illyrian population. Archeological findings on a wider area testify about the existence of multiple villae rusticae. In the VII century there comes to the breakthrough of the Slavs who conquer Aronia and it ceases to exist.
During the subsequent thousand years there are no traces of an urban life by the sea. Only the sheppards from Bast lead their cattle to the seaside and watered them at bascza voda, a source of fresh water and it is needed to be assumed that the first constructions were built as shelters for the sheppard.
